[Wikipedia] Australia native: Acacia pycnantha, most commonly known as the golden wattle, is a tree of the family Fabaceae native to southeastern Australia. (link added by Mary Ann Machi)

[Cal-IPC] Invasive: Acacia pycnantha (golden wattle) is a shrub (family Fabaceae) with golden yellow flowers and narrow leaves found in the San Francisco Bay area and coastal ranges of California. It is native to Southeastern Australia. It favors woodland habitats. It spreads via long-lived seeds, and is dispersed by ants, birds, wind, water and dumped garden waste. Cal-IPC Rating: Watch (link added by Mary Ann Machi)